Question

Can someone help me with this statistic question, pleaseeee

Answer 1

standard error= \(\large \frac{\sigma}{\sqrt{n}} = \frac{10}{\sqrt{25}} = 2\)

Answer 2

for 95 % confidence interval you would take two standard errors

Answer 3

for 95% CI the z* is 1.960

Answer 4

yes multiply your standard error wid that

Answer 5

So i dont use [ME= z* (\mu \div \sigma)\]

Answer 6

i got 3.92
is that my answer?

Answer 7

yes, you can use sample mean since you dont have the population mean availabble

Answer 8

can you help me with another problem please

Answer 9

however thats not ur answer, wait a sec

Answer 10

no it was correct. i got a check mark by it

Answer 11

:)

Answer 12

3.92 is simply \(z*\frac{\sigma}{\sqrt{n}}\)

Answer 13

right ?

Answer 14

wow ! ok then we're good :)
are you doing the coursera course ha ?

Answer 15

this is the next question, i keep getting the answer wrong.

Answer 16

One question per post please :3 my hunnyboo xD can help you if you tag him in the next post.

Answer 17

Just post that question after you close this :)

Answer 18

OpenStudy rules~

Answer 19

yeah we can do that :)

Answer 20

but lemme take a look at the question.. .this does look similar to the previous one... again we're computing ME right ?

Answer 21

standard err = \(\large \frac{2.25}{\sqrt{10}}\)

ME = \(1.96 \times \frac{2.25}{\sqrt{10}}\)

Answer 22

you got that ?

Answer 23

now i see it.
thank you so much

Answer 24

would you use the same formula is you were supposed to find "n"

Answer 25

yes you can use...

Answer 26

\(\large 1 = z^{*}\frac{\sigma}{\sqrt{n}}\)

Answer 27

plug and chug given values

Answer 28

\(\large 1 = 1.96\frac{1}{\sqrt{n}}\)

you can solve n

Answer 29

I got it right
but the 2nd question i asked was wrong

Answer 30

oh

Answer 31

the ME= 1.96(2.25/sqrt 10)

Answer 32

that one it says wrong is it ?

Answer 33

wait hold

Answer 34

im so dumb, i rounded it wrong

Answer 35

ohhk... hope u can submit again :)

Answer 36

its still wrong

Answer 37

i got the other one right

Answer 38

Did I calculate it wrong?

Answer 39

yes, we calculated it wrong :
try this : 0.690

Answer 40

can you explain to me how did you got that number

Answer 41

http://www.wolframalpha.com/input/?i=1.96*1.113%2Fsqrt%2810%29

Answer 42

we made a blunder, we plugged in mean incorrectly instead of standard deviation

Answer 43

no its still wrong :(

Answer 44

Nothing he says is wrong... EVER

Answer 45

ack... lol im also learning statistics i can be wrong :)

Answer 46

SHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH

Answer 47

last try : 0.703
http://www.wolframalpha.com/input/?i=2*1.11181%2Fsqrt%2810%29

Answer 48

still wrong. dammnit.

Answer 49

one more :
0.689

Answer 50

http://www.wolframalpha.com/input/?i=1.96*1.112%2Fsqrt%2810%29
just messing wid the sigfigs from answer from q7

Answer 51

nope still wrong.

Answer 52

its fine, i just emailed my professor about this question

Answer 53

okie if psble do let me knw once u figure out the mystery lol

Answer 54

lol i will :D
thanks again though

Answer 55

np :)